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https://github.com/RIOT-OS/RIOT.git
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80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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* Copyright (C) 2023 Mesotic SAS
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_nrf53
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* @{
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*
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* @file
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* @brief Implementation of the CPU initialization
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*
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* @author Dylan Laduranty <dylan.laduranty@mesotic.com>
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*
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* @}
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*/
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#include "assert.h"
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#include "cpu.h"
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#include "kernel_init.h"
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#include "nrf_clock.h"
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#include "periph_conf.h"
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#include "periph/init.h"
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#include "stdio_base.h"
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#include "board.h"
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/**
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* @brief LFCLK Clock selection configuration guard
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*/
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#if ((CLOCK_LFCLK != CLOCK_LFCLKSRC_SRC_LFRC) && \
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(CLOCK_LFCLK != CLOCK_LFCLKSRC_SRC_LFXO) && \
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(CLOCK_LFCLK != CLOCK_LFCLKSRC_SRC_LFSYNT))
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#error "LFCLK init: CLOCK_LFCLK has invalid value"
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#endif
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/**
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* @brief Initialize the CPU, set IRQ priorities
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*/
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void cpu_init(void)
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{
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/* initialize hf clock */
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static_assert((CLOCK_CORECLOCK == MHZ(128)) || CLOCK_CORECLOCK == MHZ(64));
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#if (CLOCK_CORECLOCK == MHZ(128))
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NRF_CLOCK_S->HFCLKCTRL = CLOCK_HFCLKCTRL_HCLK_Div1;
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#else
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NRF_CLOCK_S->HFCLKCTRL = CLOCK_HFCLKCTRL_HCLK_Div2;
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#endif
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/* Selects external 32MHz oscillator as clock source*/
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#if (CLOCK_HFCLK == CLOCK_HFCLKSRC_SRC_HFINT)
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NRF_CLOCK_S->HFCLKSRC = CLOCK_HFCLKSRC_SRC_HFINT;
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#else
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NRF_CLOCK_S->HFCLKSRC = CLOCK_HFCLKSRC_SRC_HFXO;
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#endif
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NRF_CLOCK_S->TASKS_HFCLKSTART = 1;
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/* Enable instruction cache */
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NRF_CACHE_S->ENABLE = CACHE_ENABLE_ENABLE_Enabled;
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/* For now, disable the unused network core */
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NRF_RESET_S->NETWORK.FORCEOFF = 1;
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#if defined(MODULE_PERIPH_RTT) && (CLOCK_LFCLK==CLOCK_LFCLKSRC_SRC_LFXO)
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/* Enable P0.00 and P0.01 as XL1/XL2 if LXFO is selected */
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NRF_P0_S->PIN_CNF[0] &= ~GPIO_PIN_CNF_MCUSEL_Msk;
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NRF_P0_S->PIN_CNF[0] |= GPIO_PIN_CNF_MCUSEL_Peripheral << GPIO_PIN_CNF_MCUSEL_Pos;
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NRF_P0_S->PIN_CNF[1] &= ~GPIO_PIN_CNF_MCUSEL_Msk;
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NRF_P0_S->PIN_CNF[1] |= GPIO_PIN_CNF_MCUSEL_Peripheral << GPIO_PIN_CNF_MCUSEL_Pos;
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#endif
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/* call cortexm default initialization */
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cortexm_init();
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/* initialize stdio prior to periph_init() to allow use of DEBUG() there */
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early_init();
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/* trigger static peripheral initialization */
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periph_init();
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}
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